Cyclic prefix in ofdm matlab code

1. How to add cyclic prefix in OFDM in Matlab?
2. What is the cyclic prefix in OFDM symbol?
3. How does cyclic prefix work in OFDM?
4. How do you find the cyclic prefix?

How to add cyclic prefix in OFDM in Matlab?

Step 4 of 5 in OFDM Modulation Using MATLAB

To be effective for equalization the cyclic prefix (CP) length must equal or exceed the channel length. Define variables for QAM and OFDM processing. Generate symbols, QAM-modulate, OFDM-modulate, and then add a CP to the signal.

What is the cyclic prefix in OFDM symbol?

To combat the intersymbol interference (ISI) in a multipath channel, a cyclic prefix (CP) is inserted in the OFDM symbol. The CP refers to the cyclic extension of an OFDM symbol, that is, appending the last samples of the OFDM symbol to the front of the symbol as illustrated in Fig. 5.6.

How does cyclic prefix work in OFDM?

The cyclic prefix allows a OFDM transmitter receiver pair to accomplish to important objectives, provided that the length of the multipath channel is less than or equal to the length of the cyclic prefix plus one: 1) it eliminates interblock interference, and 2) it enables easy equalization, as for the remainder of the ...

How do you find the cyclic prefix?

Therefore, the number of samples allocated for cyclic prefix can be calculated as Ncp=Tcp*N/T, where N is the FFT/IFFT length, T is the IFFT/FFT period and Tcp is the duration of cyclic prefix.